<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator="/">
  <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
  <el-breadcrumb-item>商品管理</el-breadcrumb-item>
  <el-breadcrumb-item>添加商品</el-breadcrumb-item>
  </el-breadcrumb>
  <!-- 卡片视图区域 -->
  <el-card>
    <!-- 顶部提示区域 -->
    <el-alert
    title="添加商品信息"
    type="info"
    center
    show-icon :closable="false">
  </el-alert>
  <!-- 步骤条区域 -->
  <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
  <el-step title="基本信息"></el-step>
  <el-step title="商品参数"></el-step>
  <el-step title="商品属性"></el-step>
  <el-step title="商品图片"></el-step>
  <el-step title="商品内容"></el-step>
  <el-step title="完成"></el-step>
</el-steps>
<!-- tab栏区域 -->
<el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position='top'>
<el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave='beforeTabLeave' @tab-click='tabClicked'>
  <!-- 基本信息区域 -->
  <el-tab-pane label="基本信息" name="0">
    <el-form-item label="商品名称" prop="goods_name">
      <el-input v-model="addForm.goods_name"></el-input>
    </el-form-item>
       <el-form-item label="商品价格" prop="goods_price">
      <el-input v-model="addForm.goods_price" type="number"></el-input>
    </el-form-item>
     <el-form-item label="商品重量" prop="goods_weight">
      <el-input v-model="addForm.goods_weight" type="number"></el-input>
    </el-form-item>
     <el-form-item label="商品数量" prop="goods_number">
      <el-input v-model="addForm.goods_number" type="number"></el-input>
    </el-form-item>
    <!-- 级联选择器 -->
    <el-form-item label="商品分类" prop="goods_cat">
      <el-cascader
    v-model="addForm.goods_cat"
    :options="catelist"
    :props="cateProps"
    @change="handleChange"></el-cascader>
    </el-form-item>
  </el-tab-pane>
  <!-- 商品参数区域 -->
    <el-tab-pane label="商品参数" name="1">
      <el-form-item :label="item.attr_name" v-for="item in manyTabData" :key="item.attr_id">
        <!-- 复选框组 -->
         <el-checkbox-group v-model="item.attr_vals">
    <el-checkbox :label="cb" v-for="(cb, i) in item.attr_vals" :key="i" border></el-checkbox>
         </el-checkbox-group>
     </el-form-item>
    </el-tab-pane>
    <!-- 商品属性区域 -->
    <el-tab-pane label="商品属性" name="2">
      <el-form-item :label="item.attr_name" v-for="item in onlyTabData" :key="item.attr_id">
        <el-input v-model="item.attr_vals"></el-input>
      </el-form-item>
    </el-tab-pane>
    <!-- 商品图片区域 -->
    <el-tab-pane label="商品图片" name="3">
      <el-upload
        :action="uploadURL"
        :on-preview="handlePreview"
        :on-remove="handleRemove"
        list-type="picture" :headers='headerObj' :on-success='handelSuccess'>
        <el-button size="small" type="primary">点击上传</el-button>
      </el-upload>
    </el-tab-pane>
    <!-- 商品内容区域 -->
    <el-tab-pane label="商品内容" name="4">
      <!-- 富文本编辑器 -->
      <quill-editor v-model="addForm.goods_introduce"></quill-editor>
      <!-- 添加商品的按钮 -->
      <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
    </el-tab-pane>
  </el-tabs>
</el-form>
  </el-card>
  <!-- 图片预览的对话框 -->
  <el-dialog
  title="图片预览"
  :visible.sync="previewVisible"
  width="50%">
  <img :src="previewPath" alt="" class="previewImg">
 </el-dialog>
  </div>
</template>
<script>
import _ from 'lodash'
export default {
  data() {
    return {
      // 默认激活的步骤条
      activeIndex: '0',
      // 添加商品的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
         // 图片的数组
        pics: [],
        // 商品的详情描述
        goods_introduce: '',
        attrs: []
      },
      // 添加商品的表单验证规则对象
      addFormRules: {
        goods_name: [{ required: true, message: '请输入商品名称', trigger: 'blur' }],
        goods_price: [{ required: true, message: '请输入商品价格', trigger: 'blur' }],
        goods_weight: [{ required: true, message: '请输入商品重量', trigger: 'blur' }],
        goods_number: [{ required: true, message: '请输入商品数量', trigger: 'blur' }],
        goods_cat: [{ required: true, message: '请输入商品分类', trigger: 'blur' }]
      },
      // 商品分类列表
      catelist: [],
      // 级联选择器的配置对象
      cateProps: {
        expandTrigger: 'hover',
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      },
      // 动态参数列表数据
      manyTabData: [],
      // 静态属性列表数据
      onlyTabData: [],
      // 上传图片的URL地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传的headers请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 预览图片的绝对路径地址
      previewPath: '',
      // 控制图片预览对话框的显示与隐藏
      previewVisible: false
    }
  },
  created () {
    // 获取所有的商品分类数据
    this.getCateList()
  },
  methods: {
    // 获取所有的商品分类数据
   async getCateList () {
    const { data: res } = await this.$http.get('categories')
    if (res.meta.status !== 200) return this.$message.error('获取商品列表数据失败！')
    this.catelist = res.data
    // console.log(this.catelist)
    },
    // 级联选择器选中项变化，会触发这个函数
    handleChange () {
      // console.log(this.addForm.goods_cat)
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类！')
        return false
      }
    },
   async tabClicked () {
     if (this.activeIndex === '1') {
       const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败！')
        // console.log(res.data)
        res.data.forEach(item => {
        item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
        })
        this.manyTabData = res.data
      } else if (this.activeIndex === '2') {
        const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'only' } })
        if (res.meta.status !== 200) return this.$message.error('获取动态参数列表失败！')
        // console.log(res.data)
        this.onlyTabData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 移除图片的操作
    handleRemove (file) {
      // 将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 从pics数组中找到这个图片对应的索引
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 调用splice方法移除图片
      this.addForm.pics.splice(i, 1)
      console.log(this.addForm)
    },
    // 监听图片上传成功的事件
    handelSuccess (response) {
      // 拼接一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 将图片信息对象，push到pics数组中
      this.addForm.pics.push(picInfo)
      console.log(this.addForm)
    },
    // 添加商品
    add () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return this.$message.error('请填写必填项！')
        // 发起请求添加商品
        // 深拷贝addForm对象
        const form = _.cloneDeep(this.addForm)
        form.goods_cat = form.goods_cat.join(',')
        // 处理动态参数
        this.manyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态属性
        this.onlyTabData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals
          }
          this.addForm.attrs.push(newInfo)
        })
        form.attrs = this.addForm.attrs
        // console.log(form)
        // 发起请求添加商品，商品名称必须是唯一的
        const { data: res } = await this.$http.post('goods', form)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败!')
        this.$message.success('添加商品成功!')
        // 跳转到商品列表页面
        this.$router.push('/goods')
       })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style lang="less" scoped>
.el-checkbox {
  margin: 0 10px 0 0 !important;
}
.previewImg {
  width: 100%;
}
.btnAdd {
  margin-top: 15px;
}
</style>
